Briggs Carb stud causing gas leak

#1
I purchased a mini bike that has a 5hp Briggs motor (not sure which model) It runs good but leaks gas, i replaced the gasket between the tank and carb but it still leaks. After looking closer i see that the air filter carb stud goes thru the carb and into the gas tank. There isnt any gasket on this so gas just come right out when running.
Is there supposed to be a gasket? I cant seem to find anyone who mentions a thru carb air filter stud

When i get a chance ill take some pictures
 
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